Class OpenSSL::PKey::DSA

  1. lib/net/ssh/transport/openssl.rb
Parent: Object

This class is originally defined in the OpenSSL module. As needed, methods have been added to it by the Net::SSH module for convenience in dealing with SSH functionality.

Methods

public instance

  1. ssh_do_sign
  2. ssh_do_verify
  3. ssh_type
  4. to_blob

Public instance methods

ssh_do_sign (data)

Signs the given data.

[show source]
     # File lib/net/ssh/transport/openssl.rb, line 107
107:       def ssh_do_sign(data)
108:         sig = sign( OpenSSL::Digest::DSS1.new, data)
109:         a1sig = OpenSSL::ASN1.decode( sig )
110: 
111:         sig_r = a1sig.value[0].value.to_s(2)
112:         sig_s = a1sig.value[1].value.to_s(2)
113: 
114:         if sig_r.length > 20 || sig_s.length > 20
115:           raise OpenSSL::PKey::DSAError, "bad sig size"
116:         end
117: 
118:         sig_r = "\0" * ( 20 - sig_r.length ) + sig_r if sig_r.length < 20
119:         sig_s = "\0" * ( 20 - sig_s.length ) + sig_s if sig_s.length < 20
120: 
121:         return sig_r + sig_s
122:       end
ssh_do_verify (sig, data)

Verifies the given signature matches the given data.

[show source]
     # File lib/net/ssh/transport/openssl.rb, line 96
 96:       def ssh_do_verify(sig, data)
 97:         sig_r = sig[0,20].unpack("H*")[0].to_i(16)
 98:         sig_s = sig[20,20].unpack("H*")[0].to_i(16)
 99:         a1sig = OpenSSL::ASN1::Sequence([
100:            OpenSSL::ASN1::Integer(sig_r),
101:            OpenSSL::ASN1::Integer(sig_s)
102:         ])
103:         return verify(OpenSSL::Digest::DSS1.new, a1sig.to_der, data)
104:       end
ssh_type ()

Returns “ssh-dss”, which is the description of this key type used by the SSH2 protocol.

[show source]
    # File lib/net/ssh/transport/openssl.rb, line 85
85:       def ssh_type
86:         "ssh-dss"
87:       end
to_blob ()

Converts the key to a blob, according to the SSH2 protocol.

[show source]
    # File lib/net/ssh/transport/openssl.rb, line 90
90:       def to_blob
91:         @blob ||= Net::SSH::Buffer.from(:string, ssh_type,
92:           :bignum, p, :bignum, q, :bignum, g, :bignum, pub_key).to_s
93:       end